Raritan 6-Gallon Hot Water Heater w/Heat Exchanger Review

The Good, the Bad & the Real of the Raritan 6-Gallon Hot Water Heater w/Heat Exchanger

After years of relying on shore power or running a generator for hot water on longer voyages, I found myself in a persistent predicament: the need for readily available hot water without the constant hum of machinery or the hassle of dockside connections. This led me to the Raritan 6-Gallon Hot Water Heater w/Heat Exchanger. It promises a blend of onboard electric heating and engine-driven thermal transfer, a proposition that immediately caught my eye for its potential to maximize comfort and minimize reliance on external power sources.

My initial impressions upon unboxing were overwhelmingly positive, leaning towards a sense of robust utility. The unit feels solid, with a durable-looking polymer jacket that hints at resilience against the inevitable dampness and spray of a marine environment. It doesn’t scream “luxury,” but rather “dependable workhorse,” which is exactly what I was after.

I considered a few simpler electric-only models, but the integrated heat exchanger was the key differentiator that ultimately sealed the deal for this Raritan unit. The promise of tapping into the engine’s cooling system for free hot water when underway was too compelling to ignore. My first reaction was a quiet optimism, a feeling that this appliance might finally solve a long-standing comfort issue.

Real-World Testing: Putting Raritan 6-Gallon Hot Water Heater w/Heat Exchanger to the Test

First Use Experience

My initial testing occurred during a week-long coastal cruise, where engine hours were plentiful. Installation, while requiring basic plumbing and electrical skills, was straightforward thanks to the thoughtfully placed connections on the same side of the unit. I connected the engine coolant lines and the 120v AC power supply, and within an hour of motoring, the temperature gauge on the heater began to climb steadily.

The real test came after a full day of motoring: a hot shower followed by dishes. The 6-gallon capacity was more than adequate for my needs, providing consistent temperature and pressure. Even after a day of mixed engine use and brief generator runs, the dense foam insulation did an admirable job of retaining heat, meaning I wasn’t constantly reheating the water.

One minor quirk I noticed on first use was the slight delay in reaching optimal temperature when relying solely on the 120v element after the engine had cooled down. However, this is to be expected with any electric heating element of this capacity. The real advantage became apparent when the engine was running, making the heat exchanger the star of the show.

Extended Use & Reliability

Over the course of several months and dozens of trips, this 6-gallon water heater has proven to be an exceptionally reliable addition to my vessel. It consistently delivers hot water for both galley tasks and personal hygiene, significantly improving onboard living conditions. The glass-lined steel tank has shown no signs of corrosion or degradation, a testament to its robust construction.

The durability has been impressive; it has endured vibrations from the engine and the general rigors of marine life without issue. Maintenance has been minimal, primarily involving periodic checks of the 75 PSI T&P relief valve and ensuring the connections remain secure. I did have to replace the replaceable magnesium anode after about eight months of heavy use, which is standard practice and an easy task that significantly extends the tank’s lifespan.

Compared to a previous electric-only heater I used, this unit’s ability to utilize engine heat is a game-changer. It dramatically reduces generator run time for hot water needs, saving fuel and reducing noise pollution. While some might find the initial investment higher than a basic electric model, the long-term savings and convenience far outweigh the cost difference.

Breaking Down the Features of Raritan 6-Gallon Hot Water Heater w/Heat Exchanger

Specifications

Let’s dive into the specifics that make the Raritan 6-Gallon Hot Water Heater w/Heat Exchanger tick. This model boasts a 6-gallon capacity, which is a sweet spot for smaller to medium-sized boats, providing enough hot water for a couple of showers or a full day of galley use for two people. It operates on 120v, making it compatible with standard marine electrical systems and generators.

The standout feature is, of course, the integrated heat exchanger. This is an over seven-foot-long coil, ingeniously coiled throughout the interior of the tank. It leverages the heat from the engine’s cooling system, allowing for rapid and efficient water heating without consuming auxiliary power when underway. The connections for the heat exchanger are 3/4″ female NPT, and the plumbing connections are 3/4″ male NPT, simplifying integration into existing onboard pressure systems.

The tank itself is constructed from glass-lined steel, a material known for its durability and resistance to corrosion, which is crucial in the marine environment. This is further protected by a 75 PSI T&P (temperature and pressure) relief valve, a vital safety component. The cylindrical design of the tank is also a key spec, engineered to withstand higher internal pressures than a square-shaped tank.

Performance & Functionality

The core function of providing hot water is executed exceptionally well by this Raritan unit. When connected to the engine, the heating speed is truly impressive; I’ve seen the temperature rise from ambient to a comfortable showering temperature in under 30 minutes of steady motoring. The CFC-free foam insulation is remarkably effective, keeping water hot for extended periods even when the engine is off.

The ignition-protected thermostat offers precise temperature control, adjustable from 110°F to 160°F, with a factory setting of 120°F. This allows for customization based on personal preference and also ensures safety, especially for families with young children. The safety shut-down limit of 190°F provides an additional layer of protection against overheating.

My only minor critique regarding performance is that relying solely on the 120v element for a full tank reheat can take a couple of hours. This is not a fault of the unit, but rather a limitation of electric heating power and the 6-gallon volume. However, given the presence of the heat exchanger, this is a scenario that rarely occurs in practical, extended use.

Design & Ergonomics

The design of the Raritan 6-Gallon Hot Water Heater w/Heat Exchanger prioritizes function and durability over aesthetics, which is entirely appropriate for its intended marine application. The attractive polymer jacket not only resists corrosion but also provides a clean, unobtrusive look. All plumbing connections are conveniently located on the same side, which is a thoughtful touch that greatly simplifies installation and future maintenance.

The round tank design contributes to its sturdiness, and the overall build quality feels very robust. There’s a reassuring heft to the unit that speaks to the quality of materials used. The thermostat dial is easily accessible and provides clear feedback on its settings.

While not an ergonomic consideration in the typical sense of a handheld tool, the placement of the plumbing ports makes working with this unit significantly less frustrating than dealing with systems where connections are scattered. It’s a well-thought-out design for ease of integration into existing boat systems.

Durability & Maintenance

Raritan has a reputation for building equipment that lasts, and this water heater is no exception. The glass-lined steel tank is inherently more durable than many stainless steel alternatives, offering superior protection against galvanic corrosion and pitting. The replaceable magnesium anode is a smart design choice that allows for easy maintenance to protect the tank from acidic water and prolong its lifespan indefinitely.

The dense foam insulation is sealed within the polymer jacket, preventing water absorption which can lead to degradation and reduced efficiency in some other designs. I’ve found that routine checks of the T&P valve and occasional anode inspection are all that’s needed for long-term performance. For a piece of equipment that operates in a demanding marine environment, its demonstrated durability is a significant selling point.

Accessories and Customization Options

The Raritan 6-Gallon Hot Water Heater w/Heat Exchanger comes as a complete unit, with the heat exchanger being its primary integrated “accessory.” Raritan doesn’t typically offer extensive customization options for their water heaters themselves, as they are designed for specific vessel integrations. However, the standard 3/4″ NPT connections mean it readily accepts a wide variety of common plumbing fittings, hoses, and PEX tubing available at any marine supply store.

The ignition-protected thermostat is a key safety feature, and while adjustable, it’s not intended for user replacement with aftermarket parts. The replaceable magnesium anode is the main consumable item and is readily available, ensuring long-term tank protection. Overall, the unit is designed for robust, reliable operation out of the box with minimal need for external add-ons beyond standard plumbing components.

Pros and Cons of Raritan 6-Gallon Hot Water Heater w/Heat Exchanger

Who Should Buy Raritan 6-Gallon Hot Water Heater w/Heat Exchanger?

This Raritan 6-Gallon Hot Water Heater w/Heat Exchanger is an ideal choice for boat owners, particularly those with vessels where engine hours are regularly accumulated. It’s perfect for sailors and powerboaters who want hot water for showers and galley use without excessive generator run time or reliance on shore power. If you’re looking for a reliable, durable solution that maximizes comfort and efficiency, this model is a strong contender.

Individuals who spend extended periods away from the dock and desire consistent hot water will find this unit invaluable. It’s also a great option for replacing an aging or failing water heater where the existing plumbing is compatible. Those who prioritize longevity and are willing to invest in a quality piece of equipment that simplifies onboard living should strongly consider this Raritan.

Those who primarily operate at anchor with very limited engine use and no generator might find the electric-only heating aspect to be slow, and perhaps a simpler, dedicated electric heater would suffice. However, for anyone looking to leverage their engine’s thermal output, this unit is hard to beat. Essential complementary items would be standard marine plumbing fittings, hose clamps, and a quality PEX or marine-grade hose for the coolant lines.

Conclusion on Raritan 6-Gallon Hot Water Heater w/Heat Exchanger

The Raritan 6-Gallon Hot Water Heater w/Heat Exchanger is a well-engineered piece of equipment that successfully tackles the common challenge of onboard hot water availability. Its dual-heating system provides excellent flexibility, and the heat exchanger integration is a significant advantage for anyone who regularly runs their engine. The build quality is high, promising long-term durability in the demanding marine environment, and the glass-lined steel tank coupled with the replaceable magnesium anode ensures robust protection.

While the initial cost is higher than simpler electric-only units, the value proposition is clear: reduced generator use, fuel savings, and enhanced comfort. The slower reheat time on electric power alone is a minor concession considering the primary benefit derived from engine heat. For boaters seeking a dependable, efficient, and long-lasting hot water solution, this Raritan model is a highly recommended investment. I would confidently recommend this unit to any boater looking to significantly upgrade their onboard comfort and self-sufficiency.